Projection zoom lens and projection type display device
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United States of America Patent
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Sep 1, 2015
Grant Date -
Nov 6, 2014
app pub date -
Jul 21, 2014
filing date -
Jan 20, 2012
priority date (Note) -
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status (Latency Note)
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Abstract
A projection zoom lens substantially consists of a negative first lens group and a positive second lens group, in this order from the magnification side. The first lens group substantially consists of a first lens which is a negative meniscus lens with a convex surface toward the magnification side. The second lens group substantially consists of a positive second lens, a third lens which is a positive meniscus lens with a convex surface toward the magnification side, a negative fourth lens, and a positive fifth lens, in this order from the magnification side. The first lens group and the second lens group move along the direction of the optical axis while changing magnification. At least one of the positive lenses within the entire system has an Abbe number and a refractive index within a predetermined range. The refractive indices of the first to third lenses satisfy a predetermined conditional expression.
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